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SUBSEQUENT EVENTS (Details) - USD ($)	Aug. 31, 2018	Apr. 29, 2016	Aug. 30, 2018	Jul. 28, 2018	Jul. 29, 2017
Subsequent Event [Line Items]
sublimit of availability for letters of credit			$ 125,000,000
sublimit for short-term borrowings on a swingline basis			100,000,000
Long-term Debt				$ 150,150,000	$ 161,991,000
New ABL Loan Agreement
Subsequent Event [Line Items]
Maximum borrowing base		$ 850,000,000.0	1,950,000,000.0
Proceeds from Lines of Credit	$ 600,000,000.0	600,000,000
UNFI Canada
Subsequent Event [Line Items]
sublimit of availability for letters of credit			5,000,000
sublimit for short-term borrowings on a swingline basis			3,500,000
UNFI Canada | New ABL Loan Agreement
Subsequent Event [Line Items]
Maximum borrowing base		50,000,000.0	50,000,000.0
Minimum
Subsequent Event [Line Items]
Maximum borrowing base		$ 10,000,000	$ 10,000,000
Real estate backed term loan (gross of debt issuance costs) [Domain]
Subsequent Event [Line Items]
Long-term Debt				$ 110,000,000

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- Definition

sublimit for short-term borrowings on a swingline basis

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- Definition

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+ References

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(16))
-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03(16))
-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

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-Topic 210
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Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 14
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=98514028&loc=d3e3255-108585

Reference 2: http://www.xbrl.org/2003/role/presentationRef
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-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(f))
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Detail information of subsequent event by type. User is expected to use existing line items from elsewhere in the taxonomy as the primary line items for this disclosure, which is further associated with dimension and member elements pertaining to a subsequent event.

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